Solenoid with shunt.



AnG. EASTWOOD.

SOLENOID WITH SHUNT.

APPLIUATION rmm JUNE 7, 1910.

1,004,860, Patented 0013,1911.

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UNITED STATES PATENT OFFICE.

-ARTHUR C. EASTWOOD, 0F CLEVELAND, OHIO, ASSIGNOR TO THE ELECTRIC CON- TROLLER AND MANUFACTURING COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF, OHIO.

SOLENOID WITH SHUNT.

Specification of Letters Patent.

Patented Oct. 3, 1911.

Application filed June 7, 1910. Serial No. 565,589.

To all whom it may concern:

Be it known that I, ARTHUR C. EASTWOOD, a citizen of the United States, residing at Cleveland, in the county of Ouyahoga and State of Ohio, have invented new and useful Improvements in Solenoids with Shunts, of which the following is a speci fication.

My invention relates to improvements in electric circuits containing solenoids which are connected in series with a motor or whose energizing winding carries a large current. Where a solenoid brake-winding is in series with a motor circuit, it has heretofore been necessary to provide a different size of wire for the solenoid-winding for each size of motor.

It is the object of my invention to rovide for using one size of wire in solenoi -wind- I ings to cover a large range of motors or their equivalents.

Referring to the accompanying drawing which illustrates one of the many forms which my invention may assume, Figure 1 is a central vertical section of a brake-solenoid provided with my improvement; and Fig. 2, a diagram of a motor circuit including a solenoid winding with its brake-con nections and shunt circuit.

On the drawing, O is the frame of the solenoid and contains the winding B, which is provided with a vertical axial opening for the reciprocation of the plunger A. The plunger may be connected to various mechanisms, but I have shown it connected to the arm of the friction brake N of well-known construction. The frame C and the winding are covered by the cap-plate or'cover D, having in line with the plunger A an open-' ing which permits the plunger, on energization of the winding B, to rise and engage the switch arm E and force it into engagement with the fixed contact F, which closes.

a shunt path through the resistance element or strip H and around the said wind-' ing B. The plunger works in the brass tube K, on which the winding B is wound.

The fixed contact F, the support for the switch arm or movable contact E, and the posts 71. for the resistance element H are supported by the solenoid but separated therefrom by the insulation pieces J. The re-.

sistance element is secured to the posts it by the screws h. ance elements are provided, and for a small motor one may be used in the shunt circuit, and for larger motors other strips may be placed one on another and all secured by the screws h or in any other desired manner. The entire range of solenoids required 1n connection with motors of 10 to 100 horsepower, for example, might be covered by two standard solenoids, one having its windmg serving, for example, from 10 to 50 horse-power, and the other from 60 to 100 horse-power. With the 10 horse-power size, the shunt would not be necessary. With a' My invention is advantageous from an operating standpoint, owing to the small number of repair parts required in large installations covering a number of motors of different horse-power.

In the diagrammatic view, Fig. 2, the current passes from. the positive side of the line through the controller G, the armature L, the field M, and the solenoid winding B to the negative side of the line. The motor-current passing through the winding B, causes the plunger A to rise and release the friction brake N, and at the same time to close the contacts E and F, whereupon a portion of the motor current is diverted from the windings B and passes to the negative side of the line through.the resistance strip H and the contacts E and F.

I My invention takes into account the fact that it requires a larger number of ampere turns to cause the solenoid-plunger to act at the beginning of a stroke than itrequires to hold the plunger after it has acted, when the air-gap has been cut down to practically nothing. The size of the wire -in the solenoid winding need be only large A number of these resist- Thus, it is possible to enough to carry the amount of current required to actuate the plunger and hold it after it has reached the end of its stroke.

I claim In a motor control system, a motor, a circuit for the same, a brake winding in series with the motor, a shunt around the winding, a switch to close the shunt when current is flowing through the motor and the said Winding, a mechanical brake connected to the solenoid and made inefiective While ourrent is flowing in the winding, and means for making the brake eflective'when current ceases to flow through the inotor and the winding.

Signed at Cleveland, Ohio, this 2nd day of June, A. D. 1910.

H. M. DIEMER, P. O. CLARK. 

